we have crane busbars too, about 20ft up.
most are connected with 4 core armoured cable. it looks pretty shonky, isolator at ground level then the armoured cable within 12" of the busbars, stripped back and individual conductors connected to each of the three or four busbars.
As Reno says, its quite hard to touch the live part, they are shrouded and ours are carbon with carbon collectors, only about 1/4" opening to get your finger in
DC cranes are long gone, even before inverter drives. we have fluid couplings and direct motors
